Can an object have an instantaneous velocity if it has zero acceleration?

Which statement best explains why heating a liquid affects its viscosity? The molecules move faster at higher temperatures and overcome attractions more easily.

A spherical balloon is initially uncharged. If you spray positive charge uniformly over the balloon's surface, would it expand or contract? What would happen if you spread negative charge instead? Explain.

1. a bag is dropped from a hovering helicopter. the bag has fallen for 2 s. what is the ball's velocity at the instant its hitting the ground? what was the height of the helicopter?

How far can light travel in "the blink of an eye"? (1/3s)

When an atom that has no charge loses 2 electrons what happens?

A submarine that is in the sea what principle is that

1. It takes 26.5 N to pull a 72 kg sled across snow. What is the coefficient of friction? 2. A 565 N rightward force pulls a large box across the floor with a constant velocity of 0.75 m/s. If the coefficient of friction is 0.

A person holds onto an object for 2 minutes, but doesn't move the object. Is work done on the object?

Which two vectors add together to give a resultant with the smallest magnitude, and which two vectors add to give a resultant with the largest magnitude? in each case specify the magnitude and direction of the resultant?

The largest velocity reached by a falling object is its